Furnace for supplying drying gases



1,62 21 May 24 1927' D. E. MANSFIELD 9,9

FURNACE FOR SUPPLYING DRYING GASES V Filed Mayen l15y 192e l Patented Mayv-4,

i UNITED STATES,

DANIEL E. MANsFIELD, or WEEHAWKEN,

I 1,629,921 PATENT oFFlcE.

NEW JERSEY, ASSIGNOR T GENERAL BUB- BEIB. COMPANY, 0F NEW YORK, N. Y., AP CORPOATION 0F NEW JERSEY;

j I FURNACE FOR SUIPPLYING' DRYING' GASES.

, Application 1 ed Hatch 1,8, 1.926. Serial No. '94,5/82.

This invention. relates to a furnace for supplying drying gases, more particularly to one for supplying drying gases for the spray drying of rubberltex and similar 5 materia-ls.v

Numerous typesv of furnaces have been used for furnishing the drying gases for spray ldriers, some of'which operate by die rect-heating, others by indirect heating, and

still others by a combination of' the two methods.- ,An example of afurnace using the combination of the two methods is that disclosed in patent to Bradleyand Coiiin, -No. 1,466,443, issued August 28, 1923. This furnace has been found to be very eicient) for use with relatively large spray drying units'. However, there'is a demand for a small unit for spray drying rubber latex, to

. be used on small plantations, and the above mentioned furnace by reason of its size and lack of portability-is not so readily appliy cable for this purpose. -In the drying of i rubber latex it has been found that by the use of relatively high temperature. gases economy in operation is secured and at the same time thev dried rubber produced has itscharacteristics .changed soy that it can be Amore readily milled. f

Ann object of my 1nvention is to provide an improved furnacev for supplying high temperature drying gases. lAnother object is to provide a furnace particularly adapted for vertical operation. Still another object is to provide a furnace in which the temperature and other characteristics of the drying gases may be easily controlled. A further object is to provide a 4furnace of the l character specified which is simple, compact,

ortable. easily controlled, and economical 40 to both build and operate. ,y

l v Without .intention to limit the invention otherwise than as is required by the prior art, it consists broadly in a combustion chamber provided with means for both directly and indirectly heating drying gases,

which means at the same time functions to prevent heat losses from the furnace. It further consists in means by which equilibrium in pressure can be Vsecured in the various parts of the furnace.'v It further consists in supplying under 'fpressure the gases` to be heated. It also consists in an improved form of burner for use in the furnace. v

l For a detailed disclosure ofthe nature land objects of the invention reference is had to the accompanying specification and drawing, in which latter:

Figure 1 is a side elevation, partly in section of the furnace,

Figure 2 is a transverse vertical section takep .at right anglesto the section in F igu're Figure 3 a top"plan view of the furnace, glgure 4 1s a section of the burner nozzle, an

Fig. v5 is an enlarged detail of an air valve.

Referring to the drawing,A the numeral 1 i The lower portion of the furnace is part-` ly closed by the refractory material 5, which latter 1s 'provided with a central opening in which is disposed a burner 6, the two com# pletely closing. the lower end of the furnace. Asbestos 5- or other suitable material is disposed' between the burner nozzle and refrac tory material 5 to protect the nozzle and assist inssealing the lower end of furnace. lThe burner` may be of any suitable type, but is preferably a modified form of a centrifugal spray oil burner known to the trade as the Ray burner, to be later described.' A dome 7 is proyidedat the upper end of the combustion chamber andconnected tothe dome is an exhaust pipe 8.

Surroundin the wall 4 is a casin or jacket 9 whic is spaced from fthe wal to pravide a `chamber 10 through which the gases to be heated may circulate. By this construction the gases are not only partly heated but they' alsoA act as a heat insulator i for the furnace: Extending from the upper ,ssi

end of the 'acket 9 isa dome 11, to which is connecte the exhaust pipe..1,2, and the xhaust pipe 8 of the combustion chamber v i Vma f by means of which the combustion products from the furnace Carr-be directed into a pipe 12 opening. to the outer air. In starting Y 65* struction, the oil discharged through the igea t up the furnace some smoke and soot are gen-V erated, and inthe drying ofsome materials these lmay be ijuribusi However, by movmg thedamper 12 to the position shown in dotted lines .in Figure 2, the combustion products may be directed through pipe 12" tothe outer air until such 'time as 'the furnace is functioningproperly, when the damper may then be shifted tothe position l shown in full lines in Figure 2 to allow the combustion products to pass 'through the pipe 12 to the drier.` Y

'supply "means forV furnishing air'or combastion to the burner.` Disposed in the lower Y portion o the furnace are horizontalcylindrical sleeves 16, opening through the jacket 9' at their outery ends and torth'e inpresent instance but two of, these branches` terior of the 'combustion chamber' at their- .inner ends., Rotatably mounted in said sleeves' are cylinder valves 17 which are closed at theirouter ends and atth'eir linner lends open `into^the combustion chamber- -adjacent the burner. The valves 17 are provided with ports 18 which .are adapted to l registerl with similar ports 16' in the sleeves 16 opening into the space 10. In the prsent instance butptwo of the valves havebeen shown, but it is obvious'that any desired number may be used. The furnace is provided with any desired number of peep holes 19 spaced along the length of the combustion chamber, in order that combustion conditions may be readily ascertained and controlled. The domes 7 and 11 are also'provided with manholes 20. 1,

Burnershof the Ray type as supplied to the market can bev operated only 1n a substantially horizontal position, and in order to adapt this 'burner for use with the im provedf furnace when disp position, the construction o the burner nozzle has been modified as shown in Fi'gure4.

The nozzle 21 for supplying air for com v bustion isQ provided with spirall'directcd vanes 22 in order to impart a whlr g movement to the air. A rotatable hollow Shaft 23 is connected at its end to an oil dischargeV through the. sleeve 25, terminating in theV downwardly extending branches 27 In the vare shown, but it is obvious that any suitable number may be used. By the abovev cond in. a vertical/ The sleeve 25 secured toand rotating with 7o the cu prevents the V*escape of any oil j throng the bottom of the cup. l In operation the blower 13 and burner` 6 are started, andthe drying gas entering the jacket 9 through-the pipe'14 ilows through. 75

the jacket with a rotarymovement, and vdur- ,mg its travel it absorbs heat fromthe wall 4 and at the same time prevents heat losses from the furnace through radiation.' -The heated gas then passes up through the dome 30 11 and 'pipe 12 where it meets the high temperature combustion gases issuin from the pipe 8 and is mixed' therewith. y suitably Aregulating the speedof the blower, the rotas tion of the burner, the oil supply, the supply 35 vo f air throughpipe 15 an the supply of air through valves 17 the temperature and other characteristics ofthe drying gases may b e varied over a Wide range with the gratest ease. 1n previous furnaces of the` t pe '90 described, it hasf been the.2 custom to p ace thejblower in the supply pipe to the dryingr unit, so that the Jdrying gases are sucked ,through the furnace, under reduced pressure and at the same time the combustion in the "95' combustion chamber takes place at somewhat reduced pressure.V Another dilliculty caused by the location of the blower at this point was that the blower rapidly deterioratedfbyt reason of the intense heat of the drying gases 1w and the' latter vtherefore could not be heated to the most eicient temperature. By placl i ing-the blowery 13 in advance ofthe furnace.

the, gases to be heated are supplied under pressure, and as the blower operatesonly 1 "5- with'a cool gast the temperature of the drying gases may be raised to any desired tem:

rature.- Owing to the drying gasesfpasfs- Vlng/through the jacket 9 vunder pressure,

suction is caused at the outlet offthenozzle '11" 8 sothat combustion would ordinari] place in the chamber 3 ,un er-reduce pressure. To obviate this, Ithe burner 6 is en- 215. -taking'its air 'from the blower 13. 'this way the pressure in the combustion rotation regulated quantities of Aair may be led from the 'lower portion of rthejackett) into the combustion chamber adjacent'the burner. The valves 17 are particularly use- -ful in the case wherevfor any reasonit may be desired vto keep u the pressure 'of the their tem rature by'la reduction of the sup-v plies of o1l and air to theburner 6.

tirely closed tb the air at atmosphericpres-j .sure and is suppliedonly through the pipe, l

drying gases but at t e saine time to lowerV llVhile Vas before stated the furnace haslo and , been particularly designed for vertical oper- 'y 'langen f many'7 othery materials which can be dried 'by the use of a direct heated drying gas. ,l A'

very high temperature ofthe drying gases can be obtained when desired and atsthe same time these gases can be supplied at a desired pressure Withoutinjuryto the blowing apparatus. The furnace `is of relatively large capacity in' proportion -to its size,.it is portable, can be built and operated very econoinJ ically, is easily controlled, and can be operated by relatively unskilled labor. f

With the above'detailed disclosure it is obvious that changes will suggest themselves to those skilled in the art, and it is not desired to limit the invention otherwise than as set forth lin the appended claims. Having thus described my invention What I claim and desire to protect by gLetters Patent is: Y

IJA furnaceorsupplying drying gases comprising a combustion chamber, a gas heating jacket surrounding the same, a

burner at one end of'tl'e combustion chamber, am exhaust passage Vdirectly communieating1 with both thev combustion chamber eating jacket, means for supplying gaseous fluid under r'essurel to the.ja.cket, and means for equa iz'ing pressure linfnthe jacket and combustion chamber. f i, 2. A furnace for supplying drying gases comprising la combustion` chamber,a gas heating jacket surrounding the same, means for supplying a gaseous medium under pressure to saidjacket, an exhaustpassage coincombustion 'chamber andhjacket, a burner operatively connected to the. combustion chamber, and regulable means for e ualjizin pressure 'in the combustion cham er an jacket by supplying air from the air supply means to both the burner and the ,combust-ion chamber. s

5. A` furnace for supplying drying, gases comprising a vertical lcombustion chamber, an insulating and air heating jacket surrounding the same, apres'sure blower connected to said jacket, a common exhaust' passage from the combustion chamber and jacket, a fluid fuel burner at the end 'of the combustion chamber opposite the exhaust passage, regulable means for supplying air from the blower to the burner, and regulable means for supplying air fiom the jacketj t0 the combustion chamber. j

i -6. A' furnace for supplyingdrying gasesA comprising a combustion chamber, an insulating and air heating jacket surrounding the. same. a burner operatively connectedto the combustion chamber., a conduit for a-ir under pressure tangentially connected tothe v jacket, a common exhaust' passage from the aur chamber and jacket, and means for equalizing pressure in the chamber and jacket, 7. A furnacefor supplyingv drying gases comprising a combustion chamber, an insulating and airiheati-ng jacket surrounding the municating with the chamber and jacket, a-

fiuid fuel burner at the end of said` chamber opposite the exhaust passage, and regulable means for conducting gas. underpressurefrom'said supply means directly to the lcom-- bustion chamber. v 3. A-furnace for'suppl-yingdrying gases comprising a combustion chamber, an Ainsu-- latingand air heating jacket surrounding the same, means forfsupplymg air :under same, -a burner operatively connected to the combustion chamber, a conduit for air under pressure .tangentially connected to the jacket at the end adjacent the burner, a common exhaust passage .from the chamberand jacket, means 'for supplying lair to -jthe lburner from said conduit. and means for supplying 'air to the combustion chamber fro the jacket.

f8. furnace rforsuppl'ying dr ing gases comprising a vertical combustion c amber, an

insulating and air heating jacket surround ing the same, a burner operatively connected 4to the combustion chamber, a conduit forair ,under pressure tangentially connected to therpr'essure to'said jacket', a commonl exhaust,vh passage leading directly from both.the com? ustion chamber and jacket. a.. fluid .fuel burner operatively connected to 'said combus# tion cham? er, a'ndregulable means ,for equal@ iziitg pressure in the combusti-on chamber and jacket by supplying airj fromI the air supply means t,both the 'interior and exterior of the burner. i Y l A 4. A furnace for supplying drying gases comprising a combustion'chamber, an insulatingand air heating jacket surrounding the same, means for 'supplying air underr pressure'to said jacket. a common exhaust 66ApassageI leading directly from both said jacket at the end adjacent. the burner, ai,

common exhaust passage from-the chamber and jacket, means for supplying .air to thel burner from said conduit, and regulable means for sup lying air to the `combustion.

chamber from i he jacket.

9. 'A furnace for/ co prising a vertical combustionfchmber, an insulating rand air 'heating ]acket sur- "rounding the, same, a7 burner Iclosed td at:I mospheric ain and connected to vvsaid combustion chamber, a conduit for airvunde'r pressure tangentially 'connected to said 'acket at the e'ndadjacenty the burner, an ai supply pipe leading' burner, regulable means for supplyingiair from'the jacket. to' the combustion chamber, and` a common. exhaust chamber and jacket.

essa e from there*` P g j 130- sup'plying'dryiFng gases .i

A v'Leann-91u I0. A furna'for supplyinghi'gh tgl'nperi' Asaid pipe to -thq atmosphere, and a damper n ture dryngfgase@ comprismgya 4vertlcml for'at will dreting t e exhaust either to 10 combustion chamber, an air heating -cham- -said branchlpipe or to adrying apparatus.

"brsurrou'uding the same,means for supply- ASi hed atl New York lcounty of New 6 ing uit under pre'sxfm'lze 'to' the air hating Yor and State 'of New York, this 6th day chamben'a., commonx'exhaustpi' cammu11`iof March, 1926. catig Vith the' air-heatingc ber and .A p

combustlon chamber, ad branhnl'aa g from DANIEL 

